<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

<div id="app"></div>

    <script src="../react.js"></script>
    <script src="../react-dom.js"></script>
    <script src="../browser.min.js"></script>

    <script type="text/babel">
    class Toggle extends React.Component{
        constructor(props) {
            super(props);
            this.state = {
                isToggleOn:true
            };
            this.handleClick = this.handleClick.bind(this);
        }

        handleClick(){
            this.setState(prevState =>({
                isToggleOn:!prevState.isToggleOn
            }));
        }
        render(){
            return(
                <button onClick = {this.handleClick}>
                {
                    this.state.isToggleOn ? "ON" : "OFF"
                }
                
                </button>
            )
        }
        
    }
    ReactDOM.render(
        <Toggle />,
        document.getElementById("app")
    )
    </script>
</body>
</html>